I'm passing your quesion along, and it will also be addressed more in depth on "Advices", the new podcast hosted by Naps. 

So it sounds like you are using test as your base. Good. The chance of side effects from deca is going to be lower, if you keep your test levels higher than deca. There are several pros and cons to deca. It can be a great drug for muscle gains. It can also cause a decent amount of side effects. If you find that the side effects out weigh the benefits, you can always stop using it. If you do use it, and find that you don't like the effect it is having, you can always stop. In the future, you could give NPP a shot. Its the same drug, nandralone, but in a short ester. You can also use caber at .5mg 2x wk, if you get sexual issues